A Method of IF GPS Signal Generating Based on G Language
WU Zhong-ji · Computer Knowledge and Technology · 2013
This paper presents a method to generate GPS intermediate frequency(IF) digital signal for simulation of GPS signal based on G language with L1 modulation.This GPS IF digital signal can be served as reliable data resource in the research of de?velopment of software receiver and high-sensitivity GPS receiver based on weak signal processing.The models of GPS IF signal was designed according to signal generation module needed in signal generator,then GPS IF signal is generated by PRN code,L1 modulation,navigation data of multi-satellites,carrier and modulated noise model with adjustable intensity.The experimental results by signal processing with autocorrelation and signal acquisition showed that GPS IF signal with adjustable carrier-to-noise ratio and Doppler shift has all the characteristics of L1 modulation and real GPS signal,and it can be used in signal processing in software receiver.